Fault distance locator for underground cable circuits

Details Fault distance locator for underground cable circuits Fault distance locator for underground cable circuits

1995-06-21

1997-02-04

Regan, Maura K.

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

324533, 324534, G01R 2726

Patent

active

056002483

ABSTRACT:
A fault distance locator for underground cable circuits for calculating more accurately the location of a cable fault includes a pulse generator unit for injecting a series of chirped pulse streams into the faulted cable shortly after the cable fault has been established. The delay times between the reflected pulse signals and the sending pulse signals are obtained by a correlation process which is specially designed to eliminate the effect of noise caused by arcing voltage and thus provide an accurate calculation of the distance to the cable fault. The accuracy is further enhanced by injecting pre-fault pulse signals periodically into the cable prior to the occurrence of the cable fault in order to obtain a reference pulse signal. This pulse signal provides information concerning the speed of propagation of the cable and thus affects the distance calculation to the fault.

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patent: 5483169 (1996-01-01), Despain et al.

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